Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
INVITED TO THE CASTLE…
When I opened this, the most usual door of the model apartment I was not in a normal hallway, and... However, in order. Inside the door was as if hammered together from thick oak, the...
HYDROFOIL
This model was designed by students of Victor Pisarev, Alexei Knizhnikov and Nikita Novikov. They built it in the ship laboratory of the Moscow city Palace of pioneers. High speed of...
